[IMP] web_calendar: refresh event after fail

If an event is moved at another time, its appearance would only be
refreshed if it was successful. But in this particular instance, the
refresh may even be more useful when the change failed.

part of #9837

second half of:
opw-657863

addons/web_calendar/static/src/js/web_calendar.js

@@ -806,7 +806,7 @@ openerp.web_calendar = function(instance) {
             var index = this.dataset.get_id_index(id);
             if (index !== null) {
                 event_id = this.dataset.ids[index];
-                this.dataset.write(event_id, data, {}).done(function() {
+                this.dataset.write(event_id, data, {}).always(function() {
                     if (is_virtual_id(event_id)) {
                         // this is a virtual ID and so this will create a new event
                         // with an unknown id for us.